Gemstone



FIG. 1 is a perspective view of a first embodiment of a gemstone showingmy new design;

FIG. 2 is a left side elevational view thereof, the right, front andback side elevational views being identical thereto;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

CLAIM The ornamental design for a gemstone, as shown and described.